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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7126686e8e604466a2add16a830f9802f5761cc95557d91e91b95b07a0b894d' 
  AND token = '1Mx3Ca7X6vNi/qtmlY7SpNVAYmdsB4hydgg8i2i7Mr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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