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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0e2ba48f6f1ab363205f09b128d8bf7933d0fd6e99c301c62f75191c7fea87' 
  AND token = 'Eiy3SYlDYwG7vvor9mShouxCWoBBijgej0kJ2bxrrSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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