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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb2571a8d937838a74848bbb8897ab7ab5b3fb98a6b0eaf4c2e1d7b2c8d0a07' 
  AND token = 'G16LDA8R1oYk2tQhKbcSst82CO8DPwPZ1izdEgTNcN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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