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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e36b6aca0a65664be18f46fe81507216275b33a8edf41b245e85e116529f15' 
  AND token = 'LFdCx0Xud5EfFSA6tK1mvJ8I/qJjUR3VAO7KQ2pLL5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}