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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a4e9e584d9caad738039f12c7e157dbb6c1df2e84d787bd3c6d3d585b54cb1' 
  AND token = 'IJrDrRAybhSzQMGud2w3+gJxqQ4PNuFoLcdHiLVzUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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