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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46821bb299c11cd45a3c4d118e4095dc032861bdf8c87918ff7e3f6ca13b0dac' 
  AND token = 'L2OhywdfHn56Nv4lOjI2SqytD9+yW7B5CHyQ7agxUeg=' 
  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"
    }
  }
}