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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc1d6bd301330f3981d922f1eae641af6b7a1bbfae293420150e50e8869f363' 
  AND token = 'RHRQommFsQ1rnqO4IQ6DRALj52dZqRR31BC2ZW3MLmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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