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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3621438c366c0fe384d32ebfbb050926f6012e5832564734a0b3c7b87168e970' 
  AND token = 'U7XGuarMcE297fTJSf5p4Q7OMpNgRIT+4SdRdlYKYo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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